Vine in theory can be fun, but can be very easily abused. Anyone can follow your child, they don't need to get their request approved like on facebook or instagram. You dont know how many inapproprite people are viewing your child's innocent videos. You can create an account under a false name and do a lot of damage. Soeone sent naked male videos and lewd comments to my 13 yr old daughter and her friends, just by following them, the gross video showed up in their activity. Vine has been negligent in responding to reports of abuse. The video and account has been reported repeatedly and vine has yet to respond, over 2 weeks later. Vine has a lot of potential for fun, but too much potential for abuse and almost no restrictions. In order to block someone from your account you need to know where that option is "hidden". Vine does not appear to be run responsibly. They put it out there without planning for abuse and consequences.